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Engineering Polarons at a Metal Oxide Surface

Yim, CM; Watkins, MB; Wolf, MJ; Pang, CL; Hermansson, K; Thornton, G; (2016) Engineering Polarons at a Metal Oxide Surface. Physical Review Letters , 117 (11) , Article 116402. 10.1103/PhysRevLett.117.116402. Green open access

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Abstract

Polarons in metal oxides are important in processes such as catalysis, high temperature superconductivity, and dielectric breakdown in nanoscale electronics. Here, we study the behavior of electron small polarons associated with oxygen vacancies at rutile TiO2(110), using a combination of low temperature scanning tunneling microscopy (STM), density functional theory, and classical molecular dynamics calculations. We find that the electrons are symmetrically distributed around isolated vacancies at 78 K, but as the temperature is reduced, their distributions become increasingly asymmetric, confirming their polaronic nature. By manipulating isolated vacancies with the STM tip, we show that particular configurations of polarons are preferred for given locations of the vacancies, which we ascribe to small residual electric fields in the surface. We also form a series of vacancy complexes and manipulate the Ti ions surrounding them, both of which change the associated electronic distributions. Thus, we demonstrate that the configurations of polarons can be engineered, paving the way for the construction of conductive pathways relevant to resistive switching devices.

Type: Article
Title: Engineering Polarons at a Metal Oxide Surface
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.117.116402
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.117.116402
Language: English
Additional information: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, TIO2(110), TIO2, DISSOCIATION, SCIENCE, WATER, H2O
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1518009
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